What sites are monitored?

Does it look at comments too?

Yes. F5Bot scans both submissions and comments. See here for more info.

Are keywords/phrases case-sensitive?

No. Keywords and phrases will match regardless of capitalization.

Can it let me know when my website is submitted?

Yes. You can enter a partial URL as a keyword to track. Make sure the "track
whole word only" box is unchecked.

How can I test that it works?

You can post your keyword or phrase on Reddit in the test
subreddit. You should expect an email from F5Bot a
couple minutes after you do.

What are the limits?

Each account is allowed a maximum of 200 keywords. If you need more than that,
please contact me. Don't create multiple accounts to subvert the
limit.

Additionally, if a keyword is hit more than 50 times in a 24 hour period, it
will be disabled. You can manually re-add the keyword from your account. Keep
in mind that F5Bot is designed to alert you about fairly uncommon keywords or
phrases. If you're trying to monitor a very popular brand, this might not be the
right tool for you.